I had build an Activex Control that can
plot 3D Surfaces with VC++ (Opengl) .
But When I insert the control in a vb form
and take 2 instances on the form i found
that the first instance deactivated where the
second is enabled .when i insert a third one
i found that the first and the second
instances deactivated and the third run and
so on .
Does That Problem in the double Buffer Of
OpenGL .I Mean when I use the new instance
its double buffer replaces the Old One
I HOPE YOU ANSWER ME PLEASE ?
You might have to make the rendering context for each control “current” using wglMakeCurrent before doing any drawing.
you should be able to have 20 separate openGL windows running at once if u want… it will be slow from the context switches, but it should work.
here’s a few guesses:
maybe the “deactivated” ones just aren’t calling glSwapBuffers()?
have you made a separate gl context for each window, and do you make it current before you try drawing to it?
have you put idle timers in your code to update the windows even when they don’t have focus?
what do you mean exactly by “deactivated” anway? blank? frozen?
btw - if they are in-process controls, you have to be careful about globals - especially singletons - which are used a lot in graphics projects.